title: Study on bioadsorption and biodegradation of petroleum hydrocarbons by a microbial consortium.
abstract: A microbial consortium isolated from Shengli oilfield polluted sludge was capable of degrading naphthalene (NAP), phenanthrene (PHE), pyrene (PYR) and crude oil. It performed high biodegradation activity and emulsifiability for petroleum hydrocarbons, and was tolerant to 6.2mM Cu(2+), 2.7 mM Zn(2+) and 9.5mM Pb(2+). Biodegradation rates of NAP, PHE, PYR and crude oil were 53%, 21%, 32% and 44% in the presence of heavy metal (Cu(2+), 1.7 mM and Zn(2+), 2mM), respectively. Exploration on the adsorption and uptake of petroleum hydrocarbons by microbe suggested the stability of surface adsorption and cell uptake by live microbial consortium followed a decreasing order of NAP > PHE ≈ PYR > crude oil. The adsorption by heat-killed microbial consortium was constant for PAHs, while decreased for crude oil. Experiments on enzymatic degradation indicated that the metabolic efficiency of periplasmic, cytoplasmic and extracellular enzymes secreted by the microbial consortium for diverse substrates was different.
authors.affiliation: Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, Shandong Province, China.
authors.forename: Nana
authors.initials: N
authors.lastname: Xu
authors.forename: Mutai
authors.initials: M
authors.lastname: Bao
authors.forename: Peiyan
authors.initials: P
authors.lastname: Sun
authors.forename: Yiming
authors.initials: Y
authors.lastname: Li
mesh_terms: D000327:Adsorption / Q000187:drug effects; D001419:Bacteria / Q000187:drug effects / Q000378:metabolism; D001673:Biodegradation, Environmental / Q000187:drug effects; D005110:Extracellular Space / Q000187:drug effects / Q000201:enzymology; D006358:Hot Temperature; D006838:Hydrocarbons / Q000378:metabolism*; D057927:Hydrophobic and Hydrophilic Interactions / Q000187:drug effects; D019216:Metals, Heavy / Q000633:toxicity; D059013:Microbial Consortia / Q000187:drug effects; D008826:Microbial Sensitivity Tests; D009281:Naphthalenes / Q000378:metabolism; D019897:Periplasm / Q000187:drug effects / Q000201:enzymology; D010578:Petroleum / Q000378:metabolism*; D059392:Petroleum Pollution; D010616:Phenanthrenes / Q000378:metabolism; D010802:Phylogeny; D011721:Pyrenes / Q000378:metabolism; D012722:Sewage / Q000382:microbiology; D013500:Surface Tension / Q000187:drug effects
chemical_list: D006838:Hydrocarbons; D019216:Metals, Heavy; D009281:Naphthalenes; D010578:Petroleum; D010616:Phenanthrenes; D011721:Pyrenes; D012722:Sewage; C031721:naphthalene; C031181:phenanthrene; C030984:pyrene
keywords: Bioadsorption; Biodegradation; Crude oil; Heavy metal; PAHs